/**
 * Licensed to Apereo under one or more contributor license agreements. See the NOTICE file
 * distributed with this work for additional information regarding copyright ownership. Apereo
 * licenses this file to you under the Apache License, Version 2.0 (the "License"); you may not use
 * this file except in compliance with the License. You may obtain a copy of the License at the
 * following location:
 *
 * <p>http://www.apache.org/licenses/LICENSE-2.0
 *
 * <p>Unless required by applicable law or agreed to in writing, software distributed under the
 * License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
 * express or implied. See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apereo.portal.io.xml.permission;

import com.google.common.base.Function;
import java.util.regex.Pattern;
import org.apereo.portal.utils.Tuple;
import org.dom4j.Node;

/** Generates the correct file name for a Permission Set */
public class PermissionSetsFilenameFunction implements Function<Tuple<String, Node>, String> {
    public static final Pattern SPLIT = Pattern.compile("\\|");

    public static String[] splitKey(String key) {
        final String[] keyParts = SPLIT.split(key);
        if (keyParts.length != 5) {
            throw new IllegalArgumentException("PermissionSets key must have five parts");
        }

        return keyParts;
    }

    @Override
    public String apply(Tuple<String, Node> data) {
        final String[] keyParts = splitKey(data.first);

        final Node node =
                data.second.selectSingleNode(
                        "/permission-set/principal/child::node()/child::text()");
        final String principal = node.getText();
        return principal + "__" + keyParts[3] + "__" + keyParts[0];
    }
}
